Grinding-machine.



No. 869,218. PATENTED OCT. 22. 1907.

G. W. GONKLIN.

GRINDING MACHINE.

APPLICATION FILED APR.26.1906.

3 SHEETS-SHEET l.

1TTOHNEY PATENTED 001. 22. 1907. r G. w. .GONKLIN.

GRINDING MACHINE APPLICATION FILED APR. 6.1906.

llllH "'Wh V WITNESSES INVENTOH ATTORNEY 8 SHEETS-SHEET 2 No. 869,218. PATENTED OCT. 22. 190?.

G. W. GONKLIN.

GRINDING MACHINE. APPLIOATION FILED APR.26.1906.

3 SHEETS-SHEET 3.

WITNESSES lNVENTOH J WW. BY v ATTORNEY GEORGE W. CONKLIN, OF SHEL'ION, CONNECTICUT.

GRINDING-MACHINE Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed April 26, 1906. Serial No. 313,808-

To all whom it may concern:

Be it known that I, GEORGE W. CoNKLrN, a citizen of the United States, residing at Shelton, county of Fairfield; State of Connecticut, have invented a new and useful Grinding-Machine, of which the following isaspecification. v

This invention relates to certain new and useful improvements in grinding machines.

The invention has for its object the production of a grinding wheel of relatively large diameter, the grinding surfaces of which are located on the opposite faces thereof. r v

A further object is to provide a' grinding surface formed of blocks of'abradingmaterial secured to the wheel body, and means for securing said blocks in position' in such manner that'they may be readily removed for repairs or renewal and yet will not be thrown out by centrifugal force.

The invention will be hereinafter fully set forthenlarged scale showing the manner in which the wheel is journaled, the belt pulley being removed; Fig. 7 an elevation on an enlarged scale of iny novel work rest detached; Fig. 8 a similar view from a point at right angles to the point of view in Fig. 7; Fig. 9 a top plan view corresponding with Fig. 7 and Fig. 10 is an elevation, the point of view being the reverse of that in Fig. 8.

1O denotes the body or web'of. the grinding-wheel which is mounted to rotate on a fixed shaft 11 which is supported .in a suitable frame indicated by 12, the shape or design of the frame being wholly unimportant so far as the principle of the invention is concerned.

13 denotes the hub of the wheel and 14 a belt pulley rigidly secured thereto, the grinding-wheel in use being driven by means of a belt, not shown, passing over this pulley or in any ordinary or preferred manner. This grinding-wheel in use is preferably made six feet more or less in diameter, although the principle of the invention is equally adapted to smaller sized grindingwheels.

15 denotes the rim of thegrinding-Whcel which is made considerably thicker than the Web and is provided on opposite sides with grooves 16 which receive blocksor sections of abrading material, for example emery, indicated by 17 which constitute the grinding surfaces of the wheel; These abrading blocks are in general configuration truncated sectors. say, their inner and outer peripheries are arcs of circles of which the shaft is the center. The sides of the blocks taper from the bases which lie in the grooves of the wheel toward the faces which are narrower than the bases, and the ends of the blocks are plane surfaces lying at an angle to a radial line, so that each block locks the end of a contiguous block against radial movement outward. For convenience I have indicated the sides of the blocks by a, the ends thereof by b, the bases by c and their outer or grinding faces by d.

The blocks are secured in place in the grooves in the rim by means of locking blocks 18 which are held in place by screws 19 passing throughthe blocks and engaging the rim of the wheel. These locking blocks are curved on their outer faces to correspond with the curvature of the outer walls of the grooves and are curved and tapered on their inner faces to correspond with the curvature and taper of the abrading blocks. 1 preferably form serrations 20 upon the inner faces of the locking blocks and interpose between the locking blocks and the abrading blocks plates 21 of lead or other soft metal or alloy which when the locking blocks are drawn to place by the screws firmly engage the serrations in the locking blocks and are also forced into locking engagement with the rough sides of the abrading blocks, thereby securing the latter rigidly in place against the possibility of their being thrown out.

22 denotes a guard which incloses the periphery of the grinding-wheel and which is rigidly secured to the frame. i

In Fig. 6 I have illustrated a form of bearings for the grinding-wheel which I have used in the machine and find admirably adapted for the purpose. Description however is not thought to be required as the bearing is in common use and specifically forms no portion of the present invention.

As already stated on account of the relatively large diameter ofthe grinding-wheel and the distance of the grinding surfaces from the belt pulley, four men can work at the wheel simultaneously just as well as one or two.

In Fig. 4 I have illustrated on opposite sides of the Wheel a novel universally adjustable work rest which I shall presently describe, and in Fig. 5 I have shown one side of the wheel, the right as it appears in said figure, as provided with a form of work holder in common use, the left side of the wheel being left for hand grinding that is grinding in which the operator holds the work in his hand. At the right in Fig. 5, 51 denotes a piece of work which is held by an ordinary form of work holder which I will indicate as a whole by 52-but will That is to the bed plate of the frame.

the upper end of the carrying plate as at 36.

other being indicated by 39, see Fig. 8.

not describe in detail as specifically it forms no portion of my present invention.

My novel work rests are so constructed as toprovide a universally adjustable support for a piece of work of 5 any shape or size, thus enabling a surface to be ground at any angle to the normal face of the work that may be required. Each rest comprises a shank 23 having at its lower end a two-part hub 24 which is mounted to oscillate on a transverse stub 25 mounted in brackets 26 on At the upper end of each shank is a head 33 having a transverse groove 27 which receives a rib 28 on a carrying plate 29. The carrying plate is locked in position to give any required adjustment of the table rest, indicated by 30, toward or from 15 the grinding surface of the wheel by means of bolts 31 which pass through a slot 32 in the head. The top of the carrying plate is inclined downward and backward as indicated at 34, see Figs. 4 and 10. Upon the under side oi the table is angle plate 35 which is pivoted-to N car the lower end of the angle plate is an arc-shaped slot 37 through which a locking screw 38' passes. Two holes are provided in the carrying plate to receive this screw, one of said holes being occupied by the screw and the It will be readily understood from this-figure that should it be desired to tilt thetable forward toward the grinding wheel it is simply necessary to loosen the locking screw, tilt the table to the desired inclination and then lock it 30 in position by means of the locking screw. Should the conditions of use require that the table be tilted backward away from the grinding wheel, the locking screw would be removed from the hole it occupies in Fig. 8 and be placed in hole 39. This would permit the table 3 5 to be tilted backward, and locked at any desired adjustment by tightening up the locking screw. It will thus be seen that adjustment of the table by means of locking screw 38 and the arc-shaped slot enables the operator to grind a surface on a piece of work at any 40 desired angle to the vertical plane. A similar adjustment in the horizontal plane is supported by means of a guide 40 which is adjustable at any angle to the plane of the table. At each corner of the table is a threaded hole 41. The guide is provided at one end with-a hole through which a pivot screw 42 passes freely and engages one of the threaded holes in the table. At the other end of the guide is an arc-shaped slot 43. A locking screw 44 passes through this slot and engages the threaded hole in the table in the rear of the hole oc -cupied by the pivot screw. The work to be ground rests upon the table and against the guide and is held in engagement with the grinding surface of the wheel. By loosening the locking screw and swinging the guide I on its pivot it is obvious that the guide may be set to grind a surface upon one side of the piece of work at any angle oblique to the normal face of the work that may be required. To grind a surface oblique to the normal face of the work upon the other side thereof, the locking screw and pivot screw would be removed,

the guide reversed and then attached in the same manswung out of operative position by means of a spring 45 which bears against a lug 46 on the base and a lug 47 on the shai'ik. The spring is shown as loosely inclosed in a sleeve 48. This sleeve also serves as a stop to limit the movement of the rest in swinging it out of operative position through the engagement of lug 47 on the shank with the top of the sleeve. The shank and work rest may be locked in any required position or any required amount of friction placed thereon by means of a washer 49, see dotted lines Fig. 4, which is socketed in bracket 26 and may be forced against the end of hub 24 by means of set screws 50 in the bracket.

In use, one, two or three operators can work at the wheel at the same time, the work being held by hand,

or by means of an ordinary work holder 52, as in Fig. 5. Or the Work may be carried by my universal adjustable rest as in Figs. 4, 7 and 8. In using my novel rest the work is carried by the table and is retained in the desired alinement by the guide. By means of the adjustments of the guide. in the plane of the table, already described, and the adjustment of the table in the ver tical plane also described, the work may be supported in a position to grind a surface upon any portion thereof and at any angle to the normal face of the work. In addition to these adjustments an adjustment of the table toward or from the grinding wheel is provided. The adjustable rest is normally self-retaining in opera tive position but may be readily swung out of operative position and may be rigidly locked either in or out of operative position, if required.

From what has been said it will be observed that I have produced a grinding machine of relatively large diameter, the opposite faces thereof being provided with continuous uninterrupted grinding surfaces. the advantages of which will be fully rmprcciatcd by those skilled in the artto which the invention appcrtains. It will also be observed that I have provided simple and improved means for securing the grinding blocks in position whereby they may be readily removed when worn, but will not be displaced by the centrifugal force generated in the operation of the machine.

Having thus described my invention I claim:

1. A grinding wheel comprising a web or body provided with a thickened rim having each face cut out to form an annular groove and a centrally located dividing wall, and a plurality of abrading blocks secured in each groove and resting against said central wall, the exterior faces of said blocks presenting a continuous uninterrupted grinding surface.

2. A grinding wheel comprising a web or body provided -with a thickened rim having its side faces cut out to form annular grooves and a centrally located dividing wall, a plurality of abrading blocks located in each groove and resting against said wall, the exterior faces of said blocks presenting a continuous uninterrupted grinding surface, and locking blocks secured to said dividing wall and engaging said abrading blocks.

3. A grinding wheel comprising a web or body provided .with a thickened -rim having its side faces cut out to form annular grooves and a centrally located dividing wall, a plurality of ahrading blocks located in each groove and resting against said' wall, the exterior faces of said blocks presenting acontinuous uninterrupted grinding surface. locking blocks secured to said dividing wall, and plates of soft material interposed between said locking blocks and said ahrading blocks.

LIA grinding wheel comprising a web or body provided with a thickened rim having its side faces cut out to form annular grooves and a centrally located dividing wall. abrading blocks secured in said grooves and having tapered edges, the exterior faces of said abrading blocks presenting inclined edges of the abradingblocks. f of two witnesses,

a continuous uninterrupted grinding surface, locking blocks tapering sides and ends oblique to a radial line, and locksecured to said dividing wall and provided with inclined ing blocks carried by said wall and engaging said abrading serrated surfaces, and plates .of soft material interposed blocks.

between the serrated faces of the lockingblocks and the In testimony whereof I atfix my signature, in presence 5. A grinding wheel comprising a web or body provided with a thickened rim having its side faces cut out to form annular grooves and a centrally located dividing wall, abrading blocks secured in said grooves and having curved GEORGE W. CONKLIN. Witnesses:

PEARL H: ROBINSON, HARRY H CATLIN. 

